In one of the hands­on investigations, as part of Discovered program, we had 
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DiscoverED Covering topics such as earth, animals, technology, water, biology, chemistry and space, these science lesson plans and activities are perfect for teaching students the basics of science. Challenge kids from an elementary to high school level with science activities that they will enjoy.

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Science activity centers for preschoolers

In one of the hands­on investigations, as part of Discovered program, we had In one of the hands­on investigations, as part of Discovered program, we had 

a fun activity that models the circulatory system of the human body. This is a 

learning from teaching  that particular investigation.

Models are an excellent tool to teach science. But not all models are exact 

replicas of the system that is being explained. science experiments in primary school

Even though every model requires a certain degree of abstract relation 

between the components of the model and the components of the system, 

each of them would have a slightly different level of abstraction.

1. For example , a physical model of the eye would have convincing 

similarity to the way a real eye looks. If it is a scale model then there is 

similarity in proportions of the original system [eye] and the model 


2. But when we use the model to talk about how the lens in the eye works,

it requires a bit of imagination to see how the lens of the eye changes 

its shape using the lens in the physical model [That does not actually 

show the change in lens shape of eye.

3. If we talk about how the lens helps in focusing the image on the retina, 

the physical model is not much help as the person has to imagine how 

the lens would work and how the image is focussed onto the retina.

The same model has increasingly higher levels of abstraction required 

by the learner in the 2 and 3rd example. This is because the comparison 

between the model and the original phenomena is not similar.

Science activity centers for preschoolers

The working of lens in the eye could be better explained using a drop of water The working of lens in the eye could be better explained using a drop of water 

and how its focal point changes when it is stretched. The thicker the water 

drop, the more different the image. This changes much like the lens in the 

eye. This requires less effort by the learner to relate both phenomena. science

experiment for kids at school

4. Similarly, for explaining the way image is focussed on the retina, we

could use a convex lens on an optical bench to focus a picture on a white

screen. This is far easier for the learner to relate to than just explaining

about focus using a clay physical model of the eye.

5. Thus, I believe when designing a model for use in a classroom, one must

keep this abstraction minimal. But the discussion is open.